Dataset: Time Series Water Column Parameters
Deployment: AT42-19

Time series of oxygen, nitrate, methane concentrations and methane oxidation rates of the Santa Barbara Basin deep water column

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/872703

Principal Investigator:

David L. Valentine (University of California-Santa Barbara, UCSB)

Co-Principal Investigator:

Tina Treude (University of California-Los Angeles, UCLA)

Scientist:

Franklin S. Kinnaman (University of California-Santa Barbara, UCSB)

Student:

Kelsey M. Gosselin (University of California-Santa Barbara, UCSB)

Na Liu (University of California-San Diego, UCSD-SIO)

Qianhui Qin (University of California-Santa Barbara, UCSB)

Contact:

Qianhui Qin (University of California-Santa Barbara, UCSB)

BCO-DMO Data Manager:

Sawyer Newman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: Chemical and microbiological studies of water-soluble alkanes in the ocean (CASA)

Collaborative Research: Do benthic feedbacks couple sulfur, nitrogen and carbon biogeochemistry during transient deoxygenation? (BASIN)

Version:

Deployment Synonyms:

BASIN 2019, BASIN19

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Description

Methods & Sampling

Dataset acquisition description

Methodology:

Sampling and analytical procedures:

 Densities were calculated from CTD-measured parameters (Seabird SBE 19plusV2 Seacat Profiler system).

Methane concentrations were measured by headspace equilibration method, modified from Kinnaman et al., 2007.

Oxygen concentrations were measured by ODF Winkler titration method.

Nitrate concentrations were measured by flow injection analysis (FIA) using the QuikChem 8500 Series 2 (Lachat Instruments, Zellweger Analytics Inc.)

Fractional methane turnover rates were analyzed based on the 3H-labeled methane incubation protocol by Bussmann et al., 2015.

Methane oxidation rates were calculated assuming adherence to the first-order rate law, by multiplying fractional methane turnover rate and ambient methane concentration (Valentine et al., 2001).

Samples were collected from R/V Connell and R/V Atlantis.

Data Processing Description

Dataset Processing Description

Processing notes from researcher:

Time series maps were generated using Ocean Data View version 5.2.1-64 bit. Gridded fields were calculated using DIVA gridding algorithm, with X scale-length of 400 and Y scale-length of 350.

For the 8/13/19 and 8/26/19 trips, fractional methane turnover rate samples were discarded because of an apparent leaching problem with the closure tubing inside of the Niskin bottles used for sampling (leading to interference with rate measurements).

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1756242	NSF Division of Ocean Sciences
OCE-1756667	NSF Division of Ocean Sciences
OCE-1756947	NSF Division of Ocean Sciences
OCE-1829981	NSF Division of Ocean Sciences
OCE-1830033	NSF Division of Ocean Sciences

Instruments

CTD Sea-Bird 911

Supplied Name: CTD Seabird 911+ rosette with 24 10-liter Niskin bottles

Supplied Description:

For BASIN19 trips, seawater sampling was performed using R/V Atlantis’ CTD (Seabird 911+) rosette with 24 10-liter Niskin bottles. In-situ temperature was recorded by CTD and in-situ oxygen concentration was recorded by an oxygen sensor that was mounted on the rosette.

Instrument Type

Generic Name: CTD Sea-Bird 911

Acronym: CTD SBE 911

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0035/

Generic Description:

The Sea-Bird SBE 911 is a type of CTD instrument package. The SBE 911 includes the SBE 9 Underwater Unit and the SBE 11 Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). More information from Sea-Bird Electronics.

CTD Sea-Bird SBE SEACAT 19plus

Supplied Name: Seabird SBE 19plusV2 Seacat Profiler System

Supplied Description:

Seawater sampling was performed using a rosette equipped with 6 4-liter Niskin bottles, the in-situ temperatures of the water samples were recorded by the conductivity–temperature–depth recorder (CTD), a Seabird SBE 19plusV2 Seacat Profiler system attached to the rosette. 

Instrument Type

Generic Name: CTD Sea-Bird SBE SEACAT 19plus

Acronym: Sea-Bird SEACAT 19 Plus

Generic Description:

Self contained self powered CTD profiler. Measures conductivity, temperature and pressure in both profiling (samples at 4 scans/sec) and moored (sample rates of once every 5 seconds to once every 9 hours) mode. Available in plastic or titanium housing with depth ranges of 600m and 7000m respectively. Minature submersible pump provides water to conductivity cell.

Niskin bottle

Supplied Name: 6 4-liter Niskin bottles

Supplied Description:

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
sample_datetime	UTC datetime of sample collection; the date format is YYYY-MM-DDTHH:MM:SS	unitless	DateTime
Latitude_degrees_north	latitude of sample collection; a positive value indicates North	decimal degrees	lat
Longitude_degrees_east	longitude of sample collection; a negative value indicates East	decimal degrees	lon
Station_Name	station from which samples were collected; stations are either NDRO (34.2625, -120.0313), SDRO (34.2008, -120.0417), or CalCOFI (34.2749, -120.0252 W)	unitless	station
Type	sampling type; presents either as CTD or bottle	unitless	no_bcodmo_term
Depth_m	depth at which sample was collected	m	depth
density_kg_per_m3	density of seawater at a certain depth	kg/m3	density
density_stdev	standard diviation of seawater density	unitless	std_dev
methane_concentration_nM	methane concentration of the sampled water	nM	CH4
methane_concentration_stdev	standard diviation of methane concentration	unitless	std_dev
methane_oxidation_rate_nM_per_d	methane oxidation rate of methanotrophs of the sampled water	nM/d	CH4
methane_oxidation_rate_stdev	standard diviation of methane oxidation rates	unitless	std_dev
oxygen_concentration_uM	oxygen concentration of the sampled water	uM	O2
oxygen_concentration_stdev	standard diviation of oxygen concentration	unitless	std_dev
nitrate_concentration_uM	nitrate concentration of the sampled water	uM	NO3
nitrate_concentration_stdev	standard diviation of nitrate concentration	unitless	std_dev

Database

Contribute Data

Dataset: Time Series Water Column Parameters
Deployment: AT42-19

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Time Series Water Column ParametersDeployment: AT42-19

Dataset acquisition description

Dataset Processing Description

Dataset: Time Series Water Column Parameters
Deployment: AT42-19